yashsingh1/xdaforums huggingface dataset:
[Nook Color General] av8nsteve:
The 32 GB Samsung card arrived today. As expected, it did not perform the test well:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

Random Read 4KB (QD=32) : 2.784 MB/s [ 679.6 IOPS]

Random Write 4KB (QD=32) : 0.035 MB/s [ 8.6 IOPS]

Test : 100 MB [F: 0.0% (0.0/29.6 GB)] (x5)

Date : 2011/10/14 15:27:30

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

Also FWIW, I re-ran all the tests on the Sandisk card the other day, not just the 4K QD32 tests, and it didn't do as well. Then I just ran the 4K QD32 tests and it did better, but not as well as the first time. After reformatting the card the 3rd QD32 test came out in a similar range as the first test posted Wednesday.

Here are the 2nd test results on the Sandisk card:

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 20.017 MB/s

Sequential Write : 5.152 MB/s

Random Read 512KB : 19.536 MB/s

Random Write 512KB : 1.336 MB/s

Random Read 4KB (QD=1) : 3.249 MB/s [ 793.3 IOPS]

Random Write 4KB (QD=1) : 1.356 MB/s [ 331.1 IOPS]

Random Read 4KB (QD=32) : 3.055 MB/s [ 745.7 IOPS]

Random Write 4KB (QD=32) : 0.980 MB/s [ 239.4 IOPS]

Test : 100 MB [F: 0.0% (0.0/14.8 GB)] (x5)

Date : 2011/10/12 17:43:15

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

Steve
[Nook Color General] ktbzimm:
additional card data

Just wanted to post another card to avoid. I bought this a few months ago before I realized that a shiny new Class 10 wasn't going to cut the mustard.

PNY Class 10, 8 GB microSDHC

Model P-SDU8G10TEFM1

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : <redacted, cuz I can't post links yet>

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 17.645 MB/s

Sequential Write : 11.394 MB/s

Random Read 512KB : 17.789 MB/s

Random Write 512KB : 1.147 MB/s

Random Read 4KB (QD=1) : 3.220 MB/s [ 786.1 IOPS]

Random Write 4KB (QD=1) : 0.015 MB/s [ 3.6 IOPS]

Random Read 4KB (QD=32) : 3.935 MB/s [ 960.6 IOPS]

Random Write 4KB (QD=32) : 0.014 MB/s [ 3.5 IOPS]

Test : 50 MB [E: 0.0% (0.6/7631.0 MB)] (x5)

Date : 2011/11/07 22:31:29

OS : Windows 7 [6.1 Build 7600] (x86)

I just ordered a few "SanDisk microSDHC 8GB Class 2 Card with SD Adapter (SDSDQ-8192)" from Amazon tonight. If the test results differ from what's posted, I'll add them. I figured it was a safe bet when I checked the reviews and saw A.Fenderson listed.
[Nook Color General] ktbzimm:
SanDisk results

Received my SanDisk cards today. Here's what I ordered from Amazon:

# ASIN: B001B1AR50

# Item model number: SDSDQ-8192

Much like A.Fenderson, I ordered 8 GB Class 2, but 8 GB Class 4 arrived. Here are the results I got:

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : <>

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.330 MB/s

Sequential Write : 4.542 MB/s

Random Read 512KB : 18.147 MB/s

Random Write 512KB : 1.325 MB/s

Random Read 4KB (QD=1) : 3.337 MB/s [ 814.7 IOPS]

Random Write 4KB (QD=1) : 1.165 MB/s [ 284.4 IOPS]

Random Read 4KB (QD=32) : 2.662 MB/s [ 650.0 IOPS]

Random Write 4KB (QD=32) : 0.821 MB/s [ 200.5 IOPS]

Test : 50 MB [E: 0.0% (0.0/7572.0 MB)] (x5)

Date : 2011/11/12 13:27:36

OS : Windows 7 [6.1 Build 7600] (x86)
[Nook Color General] nmm82:
2 of my sd cards

After reading this Thread I was curious about the 2 cards I have on my person pretty much at all times.

the first is a Kingston SDC4/16GB 25. C16G Japan. that lives in a IOgear microSD card reader and serves as a 16GB USB stick:

Sequential Read : 14.378 MB/s

Sequential Write : 8.115 MB/s

Random Read 512KB : 13.653 MB/s

Random Write 512KB : 1.151 MB/s

Random Read 4KB (QD=1) : 2.903 MB/s [ 708.8 IOPS]

Random Write 4KB (QD=1) : 0.011 MB/s [ 2.8 IOPS]

Random Read 4KB (QD=32) : 3.546 MB/s [ 865.7 IOPS]

Random Write 4KB (QD=32) : 0.012 MB/s [ 2.9 IOPS]

Test : 50 MB [F: 28.5% (4.2/14.9 GB)] (x5)

Date : 2011/11/16 13:11:38

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

the second came with my HTC Incredible 2 its a SanDisk class 4 16GB

Sequential Read : 21.327 MB/s

Sequential Write : 7.611 MB/s

Random Read 512KB : 20.618 MB/s

Random Write 512KB : 1.983 MB/s

Random Read 4KB (QD=1) : 3.348 MB/s [ 817.4 IOPS]

Random Write 4KB (QD=1) : 1.189 MB/s [ 290.4 IOPS]

Random Read 4KB (QD=32) : 3.308 MB/s [ 807.7 IOPS]

Random Write 4KB (QD=32) : 1.148 MB/s [ 280.4 IOPS]

Test : 50 MB [F: 39.0% (5.8/14.8 GB)] (x5)

Date : 2011/11/16 13:43:05

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)
[Nook Color General] vicdeng:
I have installed Crystal Dew World, can someone tell me how to use it to benchmark micro sd cards, thanks
[Nook Color General] waxhell:
I compiled all the test data from 31 pages into a google docs spreadsheet for easy sorting and comparison.

I stripped out all results from users who tested the speeds via the Nook's USB (because they obviously were erroneous).

https://docs.google.com/spreadsheet/ccc?key=0AjPE3ZAD2eVudE9vZmQ3aHlfTkFvU2J4ZUplRDJQTEE

Comments Under Speed / Capacity:

NP == not provided

- == not labeled (aka, SanDisk cards with no speed rating)

Looking at the data, it seems to indicate that a lot of the "non-labeled" sandisks don't seem to fare very well -- not sure if that is because of their age, or if they're counterfeit cards or what.
[Nook Color General] vicdeng:
any help on how to benchmark micro sd card? thanks
[Nook Color General] bbogner:
TomsHardware did a roundup recently for microsdhc cards. Nothing looking great here, but another good resource I think.

I can't post links, so type in the URL for Toms Hardware and after the .com put /reviews/microsdhc-memory-card-performance,3011-12.html
[Nook Color General] will25u:
Bought an 16gb class 4gb from Amazon seller was digital media source.

asin# B004XZY71G

got these results... was hoping for more but i think it will be good enough.

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.665 MB/s

Sequential Write : 5.259 MB/s

Random Read 512KB : 18.338 MB/s

Random Write 512KB : 2.745 MB/s

Random Read 4KB (QD=1) : 2.783 MB/s [ 679.4 IOPS]

Random Write 4KB (QD=1) : 1.280 MB/s [ 312.6 IOPS]

Random Read 4KB (QD=32) : 2.949 MB/s [ 719.9 IOPS]

Random Write 4KB (QD=32) : 0.806 MB/s [ 196.8 IOPS]

Test : 50 MB [H: 0.0% (0.0/14.8 GB)] (x5)

Date : 2011/12/02 18:24:48

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
[Nook Color General] KrazyDawg825:
Purchased SanDisk 16GB Class 2 on Amazon from MemoryMogul. Received SanDisk 16GB Class 4 SDSDQ-016G (Bulk Packaging). Results below were tested with adapter in the built-in memory card reader on a Dell Inspiron 2305. Testing with the Kingston FCR-HS219/1 card reader resulted in ~5 MB/s sequential read (results not posted). After changing the option from quick removal to better performance, it increased to ~19 MB/s.

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.675 MB/s

Sequential Write : 4.741 MB/s

Random Read 512KB : 18.875 MB/s

Random Write 512KB : 0.577 MB/s

Random Read 4KB (QD=1) : 2.886 MB/s [ 704.6 IOPS]

Random Write 4KB (QD=1) : 1.335 MB/s [ 325.9 IOPS]

Random Read 4KB (QD=32) : 2.668 MB/s [ 651.4 IOPS]

Random Write 4KB (QD=32) : 0.180 MB/s [ 44.0 IOPS]

Test : 1000 MB [G: 0.0% (0.0/14.8 GB)] (x5)

Date : 2011/12/04 1:45:59

OS : Windows 7 SP1 [6.1 Build 7601] (x64)
[Nook Color General] succulent:
SanDisk 32 GB Class 4 microSD SDSDQM-032G (from Amazon)

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.990 MB/s

Sequential Write : 5.979 MB/s

Random Read 512KB : 19.144 MB/s

Random Write 512KB : 0.652 MB/s

Random Read 4KB (QD=1) : 2.709 MB/s [ 661.5 IOPS]

Random Write 4KB (QD=1) : 0.710 MB/s [ 173.5 IOPS]

Random Read 4KB (QD=32) : 2.940 MB/s [ 717.8 IOPS]

Random Write 4KB (QD=32) : 1.665 MB/s [ 406.5 IOPS]

Test : 1000 MB [F: 0.3% (0.1/29.7 GB)] (x2)

Date : 2011/12/08 21:19:45

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)
[Nook Color General] popckorn:
32GB Class 4 Sandisk

I signed up just because I found this thread to be UTTERLY useful. I just bought a 32GB Class 4 Sandisk card chosen because of this thread.

With the intention to give back to the cache of information that has helped me, and expecting to be of help to further investigators, these are the results of my card:

Sank Disk 32gB class 4 > Bought at NEWEGG.COM in NOVEMBER 2011.

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 21.601 MB/s

Sequential Write : 4.477 MB/s

Random Read 512KB : 20.577 MB/s

Random Write 512KB : 0.541 MB/s

Random Read 4KB (QD=1) : 2.138 MB/s [ 522.0 IOPS]

Random Write 4KB (QD=1) : 1.285 MB/s [ 313.7 IOPS]

Random Read 4KB (QD=32) : 2.440 MB/s [ 595.6 IOPS]

Random Write 4KB (QD=32) : 1.345 MB/s [ 328.3 IOPS]

Test : 1000 MB [E: 0.0% (0.0/29.7 GB)] (x5)

Date : 2011/12/09 17:40:29

OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)
[Nook Color General] waxhell:
Updated again with new data points (and made some corrections).

https://docs.google.com/spreadsheet/ccc?key=0AjPE3ZAD2eVudE9vZmQ3aHlfTkFvU2J4ZUplRDJQTEE
[Nook Color General] rampart51:
Nice job....I wish there were more model numbers for the SANDISKs
[Nook Color General] Nilist:
Great thread which I stumbled over while trying to get portableapps / liberkey to run smoothly off a standard SD card in my work PC.

Used an old Kingston 1GB card in the past, but wanted more space.

Went out and bought a cheapo 7USD Kingston 8GB Class 4 card and everything came to a halt. Firefox portable would slow to a crawl and become unusable.

Now running liberkey off another cheapo 7USD card: Transcend 8GB Class 4, and everything is as zippy as from the HD.

CrystalDiskMark told why:

Kingston 1GB Class ?: 4K random write 0.027MB/s

Kingston 8GB Class 4: 4K random write 0.006MB/s !!!

Transcend 8GB Class 4: 4K random write 1.083MB/s

The Kingston 8GB Class 4 is going in the digital camera...
[Nook Color General] armygreen:
ATP Industrial grade SLC microSD card random write speed

Thanks for your post! Some readers may be interested to know how industrial grade microSD cards perform using CrystalDiskMark (32bit). Industrial grade cards are SLC, can operate between -40 and +80C, and can be rewritten hundreds of thousands of times. I tested 4 ATP 2GB microSD cards (may not be SDHC) and obtained similar CrystalDiskMark results: Read 6.74-6.79MB/s, Write 0.138-0.148 MB/s (5 iterations, 50MB, 4k QD32) . (For reference, my Kingston SDC4/4GB scored 4.25 MB/s and .030 MB/s.)
[Nook Color General] solidsnake0928:
Warning: Lexar Specs ahead!

I think I may have acquired the worst micro SDHC card for running CM7 ever:

Brand: Lexar

Class: 4

Size: 16GB

Model #: 6059071A

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : (link removed)

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.208 MB/s

Sequential Write : 13.198 MB/s

Random Read 512KB : 18.896 MB/s

Random Write 512KB : 0.996 MB/s

Random Read 4KB (QD=1) : 3.531 MB/s [ 862.0 IOPS]

Random Write 4KB (QD=1) : 0.009 MB/s [ 2.1 IOPS]

Random Read 4KB (QD=32) : 3.634 MB/s [ 887.3 IOPS]

Random Write 4KB (QD=32) : 0.009 MB/s [ 2.2 IOPS]

Test : 1000 MB [G: 0.0% (0.0/14.9 GB)] (x5)

Date : 2011/12/21 17:29:09

OS : Windows Vista Home Premium Edition SP2 [6.0 Build 6002] (x86)

It works fine until the display turns off (either auto or manual) or I plug it in. Needless to say, it is useless for running CM7. The only positive is that I got it for free.

Thankfully, I have a SanDisk Class 4 4GB that works perfectly. I have not benchmarked it, but looking over the other benchmarks and the stability of CM7, I can bet it is a solid card.

I just ordered a SanDisk class 4 8GB that I will test when it gets here and hopefully I can return the Lexar for a SanDisk Class 4 16GB for testing as well.

---------- Post added at 05:08 PM ---------- Previous post was at 04:53 PM ----------

What you need to do is plug your micro SD card into your computer so that it is assigned a drive letter (E:\,F:\, etc) then bring up CDM 3 and select the drive letter that the card is assigned. Then you can click on the "ALL" button on the top left or you can select the specific benchmark you would like to read with the other green buttons.

Hope that helps.
[Nook Color General] reredundant:
Interesting results. I am currently running CM 7.2 on an ADATA class 4 with a Sandisk on the way. I'll update with results as soon as I can.
[Nook Color General] solidsnake0928:
Ok I got the new SanDisk 8GB card and here are the results:

Brand: SanDisk

Class: 4

Size: 8GB

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : (link removed)

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.514 MB/s

Sequential Write : 5.073 MB/s

Random Read 512KB : 19.087 MB/s

Random Write 512KB : 2.707 MB/s

Random Read 4KB (QD=1) : 3.310 MB/s [ 808.2 IOPS]

Random Write 4KB (QD=1) : 1.310 MB/s [ 319.9 IOPS]

Random Read 4KB (QD=32) : 2.908 MB/s [ 710.0 IOPS]

Random Write 4KB (QD=32) : 0.713 MB/s [ 174.0 IOPS]

Test : 50 MB [G: 0.0% (0.0/7572.0 MB)] (x5)

Date : 2011/12/27 17:59:45

OS : Windows Vista Home Premium Edition SP2 [6.0 Build 6002] (x86)

Obviously a lot fast on the random writing and should be good for running CM7 via Micro SD
[Nook Color General] TDO:
Brand: Samsung

Class: 10

Size: 32GB

Model #: MB-MSBGA/EU

Sequential Read : 21.79 MB/s

Sequential Write : 12.45 MB/s

Random Read 512KB : 21.40 MB/s

Random Write 512KB : 11.49 MB/s

Random Read 4KB (QD=1) : 5.402 MB/s

Random Write 4KB (QD=1) : 0.715 MB/s

Random Read 4KB (QD=32) : 5.509 MB/s

Random Write 4KB (QD=32) : 0.713 MB/s

Benchmark values look promissing. I think I will give it a try.
[Nook Color General] tonestertm:
Thanks to all who developed this thread!

So, Costco (in SoCal, at least) is now selling 16GB

Class 6

SanDisk cards, labeled microSDHC I, Mobile Ultra and no longer selling the Class 4 cards.

I purchased one on December 31, 2011 and have been running CM9 builds from uSD on the Nook Color with fine results. Previously, I have used the SanDisk 16GB Class 4 cards, also from Costco, running CM7, again with much success.

I'm posting CrystalDiskMark data from a current test on a partitioned card - note that this only tested the

first

, 250MB,

partition

. These are the slowest results I got in three tests of the first partition only. (When I originally got the card I ran a couple benchmarks with it "wide open" and got 4k random writes ranging from 1.118 to 1.268)

Sandisk 16GB Class 6 SDSDQY-016G-AC11A, Costco item# 597249

Sequential Read : 12.519 MB/s

Sequential Write : 7.375 MB/s

Random Read 512KB : 12.362 MB/s

Random Write 512KB : 1.930 MB/s

Random Read 4KB (QD=1) : 2.717 MB/s [ 663.3 IOPS]

Random Write 4KB (QD=1) : 1.330 MB/s [ 324.6 IOPS]

Random Read 4KB (QD=32) : 2.925 MB/s [ 714.2 IOPS]

Random Write 4KB (QD=32) : 1.305 MB/s [ 318.6 IOPS]

Test : 50 MB [N: 11.9% (29.8/250.0 MB)] (x5)

Date : 2012/01/10 20:52:31

Cheers!
[Nook Color General] waxhell:
Updated spreadsheet again with the additional results -- the Class 6 Sandisk looks promising thus far, but we only have one data point.
[Nook Color General] bunky213:
My contribution

Just got a new one from Amazon based on the findings posted here.

Here are my findings according to CrystalDiskMark:

Read Write

Seq 23.30 4.737

512k 22.99 0.622

4k 4.089 1.452

4k QD32 3.542 1.458

This was for a Sandisk SDSDQM-032G-B35N. 32G class 4 I'll take it!

-Jeremy
[Nook Color General] freonchill:
gskill microSHDC (got it free with pc ram order @ newegg; looks like its going in the video camera)

4gb

class 4

model? FF-TSDG4GA-C4

UPC 4 711148597875 / 8 4835400797 5

not half bad, not that good either
[Nook Color General] wizardknight:
Transend 8gb cl2

Random Read 4KB (QD=32) : 4.443 MB/s [ 1084.6 IOPS]

Random Write 4KB (QD=32) : 0.018 MB/s [ 4.5 IOPS]

Kingston 4gb cl4 japan

Random Read 4KB (QD=32) : 3.568 MB/s [ 871.1 IOPS]

Random Write 4KB (QD=32) : 0.028 MB/s [ 6.7 IOPS]

Kingston 4gb cl4 taiwan

Random Read 4KB (QD=32) : 1.866 MB/s [ 455.7 IOPS]

Random Write 4KB (QD=32) : 0.016 MB/s [ 4.0 IOPS]

no name 4gb cl2

Random Read 4KB (QD=32) : 0.900 MB/s [ 219.7 IOPS]

Random Write 4KB (QD=32) : 0.597 MB/s [ 145.9 IOPS]

sandisk 8gb cl4 china

Random Read 4KB (QD=32) : 2.170 MB/s [ 529.8 IOPS]

Random Write 4KB (QD=32) : 0.995 MB/s [ 242.8 IOPS]

Sandisk 16gb cl4 china

Random Read 4KB (QD=1) : 2.059 MB/s [ 502.6 IOPS]

Random Write 4KB (QD=1) : 0.534 MB/s [ 110.7 IOPS]
[Nook Color General] upthepool:
32gb SanDisk Class 2

Hello Everyone,

From all the posts I have read, I get the idea that a SanDisk 16gb class 2 is the best card for running the nook off the SD card. I would like to get the most space possible. What is wrong with a 32gb class 2, or 4 SanDisk?

Thanks.

Shawn
[Nook Color General] :
Sandisk 8GB class 4

Sequential Read : 13.892 MB/s
Sequential Write : 4.954 MB/s
Random Read 512KB : 13.016 MB/s
Random Write 512KB : 2.170 MB/s
Random Read 4KB (QD=1) : 4.235 MB/s [ 1034.0 IOPS]
Random Write 4KB (QD=1) : 1.321 MB/s [ 322.5 IOPS]
Random Read 4KB (QD=32) : 4.519 MB/s [ 1103.3 IOPS]
Random Write 4KB (QD=32) : 1.054 MB/s [ 257.4 IOPS]

Patriot 8GB class 4 (which I purchases before reading this thread)

Random Read 4KB (QD=32) : 3.289 MB/s [ 802.9 IOPS]
Random Write 4KB (QD=32) : 0.013 MB/s [ 3.2 IOPS]

I got a lot of "force close" with the patriot card, and the performance wasn't great either. With Sandisk, the first few hours seem a lot better than the Patriot experience, hope it holds.
[Nook Color General] wizardknight:
My new 16gb Sandisk had half the random write speed of my 4 and 8gb versions. Sandisk is still better than the other brands on average, but I would suggest going with an 8 if you can. Not saying there are not 16 & 32 gb units that are good, but I had better luck finding smaller ones with high random write speeds.
[Nook Color General] upthepool:
32 GB SanDisk Class 4 Results and Question

I bought a 32GB SanDisk Class 4 and got the following random speeds. Do I need to be concerned that the 512KB write is on the slower side?

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 21.907 MB/s

Sequential Write : 4.804 MB/s

Random Read 512KB : 21.266 MB/s

Random Write 512KB : 0.548 MB/s

Random Read 4KB (QD=1) : 3.247 MB/s [ 792.7 IOPS]

Random Write 4KB (QD=1) : 1.429 MB/s [ 348.9 IOPS]

Random Read 4KB (QD=32) : 2.918 MB/s [ 712.4 IOPS]

Random Write 4KB (QD=32) : 1.453 MB/s [ 354.8 IOPS]

Test : 1000 MB [D: 0.0% (0.0/29.7 GB)] (x5)

Date : 2012/02/01 14:20:40

OS : Windows 7 SP1 [6.1 Build 7601] (x64)
[Nook Color General] jdpdata:
Smooth Sailing Here!

Sandisk SDSDQM-032G-B35N Bought from Amazon Retail package.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 22.965 MB/s

Sequential Write : 6.302 MB/s

Random Read 512KB : 20.895 MB/s

Random Write 512KB : 7.750 MB/s

Random Read 4KB (QD=1) : 7.395 MB/s [ 1805.5 IOPS]

Random Write 4KB (QD=1) : 1.623 MB/s [ 396.3 IOPS]

Random Read 4KB (QD=32) : 7.434 MB/s [ 1814.9 IOPS]

Random Write 4KB (QD=32) : 1.596 MB/s [ 389.7 IOPS]

Test : 50 MB [F: 0.0% (0.0/29.7 GB)] (x5)

Date : 2011/12/28 10:52:51

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)
[Nook Color General] upthepool:
Weird Touchscreen Issue

With the 32GB the touchscreen was totally unresponsive. Worked perfectly with an 8. Anyone heard of this issue?
[Nook Color General] upthepool:
Touchscreen Problem Solved

Turns out it was a problem with the versions of CM7 I was using.
[Nook Color General] upthepool:
Touchscreen Issue Explained

From: Eyeballer:

http://xdaforums.com/showthread.php?t=1030227

****BRAND NEW NOOK COLORS (Dec 2011+/Jan 2012+ are now shipping with a different touchscreen/digitizer (same as used in the nook tablet). As of now this driver is not included in CM7, you are welcome to try to flash CM7, if your touchscreen is unresponsive, restore to stock or flash CM9. CM9 will work as the driver is included.***

It appears that 7.1 works, as well as the most recent nightly from Nov.
[Nook Color General] freonchill:
sandisk 8gb cl4 card; purchased on ebay seller dailysteals

ill update the post when i get a magnifying glass and can read the silkscreened code
[Nook Color General] flatulatorx:
another vote for samsung

My Samsung uSD 32GB class10 came in the mail today. Tested straight out of the retail package through a Sandisk Extreme Pro (SDXC UHS-I compatible) expresscard reader and SD card adapter.

Card is made in Korea. Purchased from Korean ebay merchant mclothesworld (not affiliated in case you're wondering) Feb 2012.

Very pleased. Samsung's class10 uSD seems to be the only one that consistently excels in both sequential and random writes. :)

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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 23.741 MB/s

Sequential Write : 12.343 MB/s

Random Read 512KB : 23.331 MB/s

Random Write 512KB : 12.070 MB/s

Random Read 4KB (QD=1) : 7.222 MB/s [ 1763.2 IOPS]

Random Write 4KB (QD=1) : 1.298 MB/s [ 316.8 IOPS]

Random Read 4KB (QD=32) : 7.635 MB/s [ 1863.9 IOPS]

Random Write 4KB (QD=32) : 1.315 MB/s [ 321.0 IOPS]

Test : 50 MB [M: 0.0% (0.0/29.2 GB)] (x5)

Date : 2012/03/05 9:32:33

OS : Windows 7 SP1 [6.1 Build 7601] (x64)

Samsung uSD 32GB class10 (Korea)